Feeding on mixed bird seed along with Common Sparrows, a few occasional Hedge Sparrows, numerous Chaffinchs, Goldfinchs and a few Greenfinchs
No interactions present.
Both adult and young Tree Sparrows undergo a complete moult of all feathers in the autumn, so you cannot age them at this time of year. Any dark feathering is probably just dirt or wet feathers or similar.
My Flickr photos...
Lat/Lng: 54.3408, -5.5778
OS grid ref: SB675998
My garden is surrounded by farmland and has many large trees. Local hedges are kept trimmed to approx 5ft high. So plenty of cover. Taken through my kitchen window, so apologies for lack of clarity.